Salt Spray Testing: Corrosion Simulation and Surface Protection Review
Salt spray testing observes corrosion behavior of materials or surface treatments under controlled salt spray conditions. It is commonly used for metals, platings, coatings, fasteners, hardware, and outdoor product parts. Results compare corrosion behavior under specified conditions and should not be directly treated as real outdoor service life.
Common Review Items
| Item | Review focus | Common risk |
|---|---|---|
| Test type | Confirm neutral salt spray, acid salt spray, copper-accelerated salt spray, or cyclic corrosion condition | The method is not selected by material and customer requirement |
| Sample status | Review material, plating, coating, scribe, cleaning status, and assembly method | The submitted sample differs from production surface treatment |
| Exposure condition | Record salt solution, temperature, spray condition, duration, and sample placement | Blocking or sample angle affects result comparability |
| Acceptance criteria | Check red rust, white rust, blistering, peeling, discoloration, and functional effect | Only appearance is recorded while functional or structural effect is not explained |
| Report scope | Confirm which material, process, batch, and surface-treatment version the report covers | One sample result is used for multiple uncovered processes |
Report Boundaries
- The report should state test method, exposure time, sample photos, defect positions, and acceptance basis.
- After material, plating thickness, coating process, supplier, or cleaning method changes, retesting should be assessed.
- Salt spray testing is an accelerated corrosion evaluation and should not be directly converted into outdoor service years.
- Customer-facing pages should avoid presenting salt spray hours as a real service-life conclusion.
Green Ark's Recommendation
Green Ark (Shenzhen) Certification Co., Ltd. recommends archiving salt spray results together with material specification, surface-treatment process, and failure photos. This helps track batch differences, supplier changes, and corrosion-protection design issues more accurately.
